Full size is the default setting. This setting uploads your photos and videos with their original image resolutions (up to 75 MB for photos or 1080p for videos) and counts against your Google Drive storage quota, which is shown under "Full size"when you touch this setting. If you have your back up setting set to full size and you run out of storage, we'll automatically switch to backing up at standard size.

Standard size photos are great for sharing on the web. If you choose this setting, your photos will be resized so that the longest edge of the photo does not exceed 2048 pixels. You can store an unlimited number of standard size photos using Auto Backup.

Over Wi-Fi or mobile network uploads photos when your device is connected to a Wi-Fi network or your mobile network. Note: Uploading over your mobile network will use your data connection and charges from your service provider may apply. If you're on a Wi-Fi only device, Auto Backup will upload via Wi-Fi only.

Over Wi-Fi only uploads photos when your device is connected to a Wi-Fi network.

Over Wi-Fi or mobile network uploads videos when your device is connected to a Wi-Fi network or your mobile network. Note: Uploading over your mobile network will use your data connection and charges from your service provider may apply. If you're on a Wi-Fi only device, Auto Backup will upload via Wi-Fi only.

Over Wi-Fi only uploads videos when your device is connected to a Wi-Fi network. Very large videos will upload over Wi-Fi only.

Enabling Roaming allows photos and videos to upload while you're roaming on a mobile data network. Note: Uploading over your mobile network will use your data connection and charges from your service provider may apply. If you're on a Wi-Fi only device, Auto Backup will upload via Wi-Fi only.

If you choose While charging only, photos and videos will be uploaded only when your device is connected to an external power source. Choosing this setting can help you manage your device's battery life when using Auto Backup.

When you touch Back up all, photos and videos on your device will be backed up according to the preferences you've set. For example, if you have Auto Backup set to run only when your device is charging and you select Back up all, your photos and videos will begin backing up only when your device is being charged.

If you sign out of the Google+ app, your backup queue is not saved. Any photos and videos that have not been backed up will only back up once you sign into the Google+ app and touch Back up all again.

Computer

After you've turned Auto Backup on, you can choose to automatically back up your photos and videos upload at full or standard size:

Open Google+. Place your cursor in the top left corner for the Google+ main menu. Click Settings.

Scroll to the "Photos and Videos" section and check or uncheck the box next to Upload my photos at full size.

Choose Full size to upload your photos and videos with their original image resolutions (up to 75 MB for photos or 1080p for videos). This will count against your Google Drive storage quota, which is shown directly beneath this setting. If you run out of storage, we'll automatically switch to storing your photos and videos at standard size.

Standard size photos and videos are great for sharing on the web and you can store an unlimited number of standard size photos using Auto Backup. Photos will be resized so that the longest edge of the photo does not exceed 2048 pixels.

Mobile browser

This setting isn't currently available using the mobile web browser.

iOS

After you've turned Auto Backup on, you can manage how and when photos and videos from your device are uploaded.

Open the Google+ app.

Touch the menu icon > gear icon > Camera and Photos > Auto Backup

From this screen, you can change these settings (touch heading to expand):

Toggle the setting to ON to choose Full size backups, which is the default setting. This setting uploads your photos and videos with their original image resolutions (up to 75 MB for photos or 1080p for videos) and counts against your Google Drive storage quota. If you run out of storage we'll automatically switch to storing your photos and videos at standard size.

Toggle the setting to OFF to back up photos and videos in Standard size, which can be great for sharing on the web. If you choose this setting, your photos will be resized so that the longest edge of the photo does not exceed 2048 pixels. You can store an unlimited number of standard size photos using Auto Backup.

Over Wi-Fi or mobile network sets Auto Backup to only upload photos when your device is connected to a Wi-Fi network or your mobile network. Note: Uploading over your mobile network will use your data connection and charges from your service provider may apply. If you're on a Wi-Fi only device, Auto Backup will upload via Wi-Fi only.

Over Wi-Fi only sets Auto Backup to only upload photos when your device is connected to a Wi-Fi network.

Over Wi-Fi or mobile network sets Auto Backup to only upload videos when your device is connected to a Wi-Fi network or your mobile network. Very large videos will upload over Wi-Fi only. Note: Uploading over your mobile network will use your data connection and charges from your service provider may apply. If you're on a Wi-Fi only device, Auto Backup will upload via Wi-Fi only.

Over Wi-Fi only sets Auto Backup to only upload videos when your device is connected to a Wi-Fi network.

When you touch Back up all, photos and videos on your device will be backed up according to the preferences you've set. For example, if you have Auto Backup set to run only when your device is charging and you select Back up all, your photos and videos will begin backing up only when your device is being charged.

When you sign out of the Google+ app, your backup queue is not saved. Any photos and videos that have not been backed up will only back up once you sign into the Google+ app and touch Back up all again.